Logstash grok parse failure, while kibana grok debugger works fine

[sahar]

Hello,
I tested a certain pattern in kibana debugger:

As you can see, it works fine, but when sending the same log to logstash I always end up getting grok parse failure, how can I check what the issue is...?

This is my logstash configuration file:

input {
  udp {
    port => 5960
    codec => plain {
      charset => "UTF-8"
    }
    type => "log4net"
  }
}

filter {
  if [type] == "log4net" {
    grok {
      break_on_match => true
      remove_field => message
      match => {
        message => "(?m)\[%{GREEDYDATA:datetime}\] \[%{LOGLEVEL:level}\] \[%{DATA:component}\] \[%{NUMBER:thread}\] \[%{GREEDYDATA:parameters}\] %{GREEDYDATA:tempMessage}((\r\n)|(\n))(?<exceptionType>(((%{JAVACLASS})|(System.))Exception)): (?<exceptionMessage>(%{GREEDYDATA}))((\r\n)|(\n))(?<stackTrace>(( )+at %{GREEDYDATA}))"
      }
      match => {
        message => "(?m)\[%{GREEDYDATA:datetime}\] \[%{LOGLEVEL:level}\] \[%{DATA:component}\] \[%{NUMBER:thread}\] \[%{GREEDYDATA:parameters}\] %{GREEDYDATA:tempMessage}((\r\n)|(\n))(?<exceptionType>(((%{JAVACLASS})|(System.))Exception)): (?<exceptionMessage>(%{GREEDYDATA}))"
      }
      match => {
        message => "(?m)\[%{GREEDYDATA:datetime}\] \[%{LOGLEVEL:level}\] \[%{DATA:component}\] \[%{NUMBER:thread}\] \[%{GREEDYDATA:parameters}\] %{GREEDYDATA:tempMessage}"
      }
    }
    if !("_grokparsefailure" in [tags]) {
      mutate {
        replace => [ "message" , "%{tempMessage}" ]
      }
    }
    mutate {
      remove_field => [ "tempMessage" ]
    }
  }
}

output {
  elasticsearch {
    hosts => ["localhost"]
    manage_template => false
    index => "ovc-%{+YYYY.MM.dd}"
  }
}

Example input:
[22/02/2020 13:32:32.6916] [INFO] [L2OvC_WebAPI.Loggers.Interfaces.ICachedAttributeLogger] [29] [Controller= Action=] No cached value found, proceeding with request.

Kibana output:

Is it maybe because message looks weird when viewing the json format? I tried to paste that into kibana debugger and it failed:

[sahar]

Solved my own problem, I had to add this to log4net configuration:
<param name="Encoding" value="utf-8" />